I have some questions about Synonym.
If I search for a word decorous on Google, and if there is no humble, I shouldn’t think they are the synonym? I checked haughty and there was not ‘audacious’, so I don’t memorize them as the same word?
Google, in most cases, lists the possible synonyms, but not all the synonyms. So, a synonymous word may not be included in the Google (synonym) list, but it can still be qualified to be a synonym.